Security Calculators

20 free security calculators in Linux.

ACL Permission CalculatorCalculate effective access permissions when POSIX ACLs override standard file mode bits.
AppArmor Profile CalculatorEstimate AppArmor profile rule coverage and enforcement mode impact on an application.
Audit Log Growth CalculatorEstimate auditd log growth rate and storage needs based on audit rule verbosity.
Certificate Expiry CalculatorCalculate days remaining until an SSL/TLS certificate expires and renewal deadline.
File Permission CalculatorConvert Linux file permissions between octal, symbolic and chmod notation instantly.
Hash Speed CalculatorEstimate hashing throughput and brute-force crack time for a given hash algorithm.
Log Rotation Size CalculatorCalculate total disk space consumed by rotated log files based on logrotate retention policy.
MD5 Checksum CalculatorCalculate MD5 checksum verification time for files based on size and hashing throughput.
Octal Permission CalculatorConvert numeric octal permission codes like 755 or 644 into readable rwx notation.
Password Entropy CalculatorCalculate password entropy in bits from character set size and password length.
Password Expiry CalculatorCalculate password expiration date from chage aging policy settings like PASS_MAX_DAYS.
SELinux Context CalculatorDecode SELinux security context labels into user, role, type and sensitivity components.
SGID CalculatorCalculate the resulting permission bits and behavior of setting the SGID bit on files or directories.
SHA Checksum CalculatorCalculate SHA-1, SHA-256 and SHA-512 checksum length and verification time for a file.
SSH Connection Capacity CalculatorCalculate maximum concurrent SSH sessions supportable under sshd MaxSessions and MaxStartups.
SSH Key Length CalculatorCompare SSH key algorithm and bit-length strength across RSA, ECDSA and Ed25519.
SSH Session Timeout CalculatorCalculate SSH idle session timeout from ClientAliveInterval and ClientAliveCountMax settings.
Sticky Bit CalculatorCalculate the resulting permission bits of setting the sticky bit on shared directories.
SUID CalculatorCalculate the resulting permission bits and security implications of setting the SUID bit.
Symbolic Permission CalculatorConvert symbolic permission strings like rwxr-xr-- into octal chmod values.