ata_dev_classify (9) - determine device type based on ATA-spec signature
dkimproxy-sign (1)   - computes a DKIM signature for an email message
dsa (3ssl)           - Digital Signature Algorithm
DSA_do_sign (3ssl)   - raw DSA signature operations
DSA_do_verify (3ssl) - raw DSA signature operations
DSA_SIG_free (3ssl)  - allocate and free DSA signature objects
DSA_SIG_new (3ssl)   - allocate and free DSA signature objects
DSA_sign (3ssl)      - DSA signatures
DSA_sign_setup (3ssl) - DSA signatures
DSA_size (3ssl)      - get DSA signature size
DSA_verify (3ssl)    - DSA signatures
ecdsa (3ssl)         - Elliptic Curve Digital Signature Algorithm
EVP_DigestVerifyFinal (3ssl) - EVP signature verification functions
EVP_DigestVerifyInit (3ssl) - EVP signature verification functions
EVP_DigestVerifyUpdate (3ssl) - EVP signature verification functions
EVP_PKEY_get_default_digest (3ssl) - get default signature digest
EVP_PKEY_get_default_digest_nid (3ssl) - get default signature digest
EVP_PKEY_verify (3ssl) - signature verification using a public key algorithm
EVP_PKEY_verify_init (3ssl) - signature verification using a public key algor...
EVP_PKEY_verify_recover (3ssl) - recover signature using a public key algorithm
EVP_PKEY_verify_recover_init (3ssl) - recover signature using a public key al...
EVP_VerifyFinal (3ssl) - EVP signature verification functions
EVP_VerifyInit (3ssl) - EVP signature verification functions
EVP_VerifyUpdate (3ssl) - EVP signature verification functions
git-verify-commit (1) - Check the GPG signature of commits
git-verify-tag (1)   - Check the GPG signature of tags
GnuPG::Signature (3pm) - GnuPG Key Signature Objects
gpgv (1)             - Verify OpenPGP signatures
Mail::DKIM (3pm)     - Signs/verifies Internet mail with DKIM/DomainKey signa...
Mail::DKIM::DkSignature (3pm) - represents a DomainKeys-Signature header
Mail::DKIM::Signature (3pm) - represents a DKIM-Signature header
Mail::DKIM::Signer (3pm) - generates a DKIM signature for a message
Method::Signatures::Simple (3pm) - Basic method declarations with signatures,...
RSA_private_encrypt (3ssl) - low level signature operations
RSA_public_decrypt (3ssl) - low level signature operations
RSA_sign (3ssl)      - RSA signatures
RSA_sign_ASN1_OCTET_STRING (3ssl) - RSA signatures
RSA_verify (3ssl)    - RSA signatures
RSA_verify_ASN1_OCTET_STRING (3ssl) - RSA signatures
sigtool (1)          - signature and database management tool
wipefs (8)           - wipe a signature from a device