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diff --git a/markdown/Requirements.md b/markdown/Requirements.md deleted file mode 100644 index 434e4db..0000000 --- a/markdown/Requirements.md +++ /dev/null @@ -1,172 +0,0 @@ -# HSM Requirements - -Requirements for the Cryptech Alpha System. Derived from Use Cases (see below). There are also utility, internal requirements (again, see below). - -## Capacity -### Per key storage requirements -In addition to the actual key data, each key requires - -- Key type – 4 bytes -- Key identifier – 4 bytes -- Key flags, e.g. exportable – 8 bytes - -This results a total 16 bytes overhead for each key. - -### Examples per algorithm -(For RSA, we might also want to include the primes p and q might also be included which requires additional storage.) - - -- RSA-8192 requires 1024 bytes secret key, 1024 bytes public key + 4 bytes exponent + 16 bytes overhead = 2068 bytes -- RSA-4096 requires 512 bytes secret key, 512 bytes public key + 4 bytes exponent + 16 bytes overhead = 1044 bytes -- RSA-2048 requires 256 bytes secret key, 256 bytes public key + 4 bytes exponent + 16 bytes overhead = 532 bytes -- EC P-256 requires 32 bytes secret key, 64 bytes public key + 16 bytes overhead = 112 bytes -- EC P-384 requires 48 bytes secret key, 96 bytes public key + 16 bytes overhead = 160 bytes -- Curve 25519 requires 32 bytes secret key, 32 bytes public key + 16 bytes overhead = 80 bytes - - - -## Use Cases -### DNSSEC -#### Number of keys - -- TLD (or provider using key sharing) requires ~ 100 key pairs -- 3 KSK per zone (previous, current, new) -- 3 ZSK per zone (previous, current, new) - -#### Possibly dual algorithms - -- A typical TLD operator usually has less than 10 TLDs -- Other DNS providers may use key sharing to limit number of keys required - -#### Algorithms - -- RSA-1024/SHA-256 -- RSA-2048/SHA-256 -- EC-P256/SHA-256 - -#### Performance -Each update to a zone requires 3-4 signatures (per algorithm) - -- Resign SOA (signed by ZSK) -- Resign updated RR (signed by ZSK) -- Resign NSEC/NSEC3 (signed by ZSK), may require multiple signatures - -Non-interactive latency (batch), dynamic updates may require faster signing - -### SAML -#### Number of keys -SAML federation operator requires max 10 key pairs (including space for roll) -#### Algorithms - -- RSA-2048/SHA-256 - -#### Performance - -- Non-interactive latency (batch) - - non-MDX: … -- Interactive latency - - MDX: … - - -### PKIX (including RPKI) -#### Number of keys - -- Typical Certification Authority ~ 10 key pairs - - CA key, OCSP, CRL per level in the CA - - Root CA is one level - - For subordinate CAs, perhaps 2-5 CAs in a HSM is reasonable? - -#### Algorithms - -- RSA-2048/SHA-256 -- RSA-4096/SHA-256 -- RSA-4096/SHA-512 ? -- EC-P256/SHA-256 - -#### Performance - -- Non-interactive latency - - Root CA: Less than 1 signature per day - - Issuing CA: One signature per issued certificate - - CRL: Less than 1 signature per hour -- Interactive latency - - OCSP: Multiple signatures per second - - -### Tor -Requirements according to (section 1): https://gitweb.torproject.org/torspec.git/plain/dir-spec.txt -#### Number of keys - -- 1 private key -- 10 public keys - -#### Algorithms - -- RSA-2048/SHA-1 ? -- RSA-2048/SHA-256 -- RSA-4096/SHA-256 ? -- RSA-4096/SHA-512 ? - -#### Performance - -- 2 signatures per hour -- 20 verification operations per hour -- 1 second max latency for RSA-2048 based verification - - -### Certificate Transparency (CT) -#### Number of keys -CT requires 1 key (ECDSA or RSA) per log -#### Algorithms - -- RSA-2048/SHA-256 -- RSA-4096/SHA-256 ? -- RSA-4096/SHA-512 ? -- EC-P256/SHA-256 - -#### Performance - -- A Certificate Transparency log uses one ECDSA or one RSA key to sign two separate documents: -- STH's might need to be signed once per hour -- SCT's might need to be signed once per second (*) - - -See RFC 6962, section 2.1.4 – https://tools.ietf.org/html/rfc6962 - - -## Internal Functional Requirements - -### Algorithms and functions - -- Key wrapping using AES-256 with SIV, http://tools.ietf.org/html/rfc5297 -- Internal Storage Master Key (ISMK) in battery backed RAM connected to FPGA - - Battery connection controlled by tamper mechanism - - Active erasure controlled by tamper mechanism -- 32-bit high quality random number generation - - -### PKCS11 - -The following PKCS11 mechanisms are required to fulfill the aforementioned use cases: - - -- RSA - - CKM_RSA_PKCS_KEY_PAIR_GEN - - CKM_RSA_PKCS - - CKM_RSA_X_509 ? - - CKM_SHA256_RSA_PKCS - - CKM_SHA512_RSA_PKCS ? -- ECDSA - - CKM_EC_KEY_PAIR_GEN - - CKM_ECDSA -- AES - - … TBD … -- Random - - … TBD … -- Key Wrapping - - … TBD … -- Hash - - CKM_SHA256 - - CKM_SHA512 (?) - - |